Malicious PDF — malware analysis report

Static analysis result for SHA-256 a338ff9e765cac67…

MALICIOUS

PDF

90.0 KB Created: 2021-08-02 02:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88a22d9a11ef78cc58d8ee57f7d2f671 SHA-1: b524993d7f15f3df0e66a9842decf284bffa8b53 SHA-256: a338ff9e765cac679d05fb4afaa5003e165554b4ab1efc10addd523f89f25dfa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be redirecting users to potentially harmful content or facilitating further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://abofahed.com/userfiles/file/badivori.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d63b08a741---vekixibuzefamu.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/3860e65150fbc5d81d3299f883d6f66c/zasemafotenatag.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/a9c8de82eb21b66401409dcc3ba41608/59687177944.pdf
    • http://thankschicken.com/uploads/files/mexadetuvopedaberadosuv.pdf
    • https://vico-real-estate.com/ckfinder/userfiles/files/pabop.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/ep6qtvd11qgqo01jdnif3lj5l5/55301507555.pdf
    • http://solee.cn/ckfinder/userfiles/files/27976846032.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105040850573317.pdf
    • http://tolltisztitas.eu/userfiles/files/jujetab.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16090d18f10bc5---62190999860.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/655vqmlg84kre9lhb393djifu6/zinovetegurove.pdf
    • http://se-ty.ru/uploads/userfiles/file/53502981786.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/e9fd9c4fc339260c8b34ef79edd64e3d/zotibiburudalifo.pdf
    • http://jmk.kr/ckfinder/userfiles/files/jonojid.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/6ee62da63bc24a7248d1d7c586bd70fe/72963248965.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16070dd5e6f8ce---52943782322.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/lotuwunawalegebigavari.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606dcd9ad2317---19738847978.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f71e7d171d---sesagunamenawilusu.pdf
    • https://tepihtrava.rs//files/boziwubijagudovulazole.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d23768308da---23810401564.pdf
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/rovovolaginefepo.pdf
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/34257810719.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=negative+binomial+distribution+standard+deviation+formula
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f929.bin
21411082087d60a039defd41159eb73ca96fa78b67b495baa1ed536b575232f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF929 17824 bytes
font_01_sfnt_off0001287c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1287C 16792 bytes
font_02_sfnt_off00014093.bin
d42a5169a41179700f6740ef8c03fe5e530def3e75e46887626a708b551a3676
pdf-font-stream PDF embedded font (sfnt) at offset 0x14093 10980 bytes